Countermeasure Against Denial-of-Service Attack in Authentication Protocols Using Public-Key Encryption

摘要

PURPOSE: A method for defending a denial-of-service attack in an authentification protocol using public key coding is provided to defend the denial-of-service attack by coding a user's random number using a public key of a server. CONSTITUTION: A server(100) generates a random number(101) and transmits the generated random number(101) to a user(110). The user receives the random number(101) from the server(100), generates a random number(111), encodes two random numbers(101,111) to a public key of the server(100), and transmits a cryptogram(112) to the server(100). The server(100) receives the cryptogram(112) from the user(110), decodes the cryptogram(112) to extract the random numbers(101,111) from the cryptogram(112). The server(100) compares the decoded random numbers with the random numbers(101,111).